Clamp for holding steel plates while being hardened and tempered



Patented Jan. 10, 1854.A

C. W. FILLMOR'E. Tempering Clamp.

UNITED sTATns PATENT oFFioE.

- CHARLES W. FILLMORE, 0F CORAL, ILLINOIS.

CLAMP FOR HOLDING STEEL PLATES WHILE BEING HARDENED AND TEMPERED.

Specification of Letters Patent No. 10,404, dated January 10, 1854.

"from Warping During the Operation of Hardening and Tempering, of which the following is a full, clear, and exact description, reference being had to the annexed drawing of the same, making part of this specification, and in which- Figure l represents a View in perspective of the clamp with its leaves closed upon a plate of steel undergoing hardening; Fig. 2 represents a section through the line fr of Fig. 1, to show the form of the bars, and the manner in which they grasp the plate; and Fig. 3 represents a section of the same at the line m The clamp consists of jaws (A andA B) united by hinges (C) so as to open and shut like folding doors. The jaws are hinged in such manner, thatwhen closed, a space will be included between them of the thickness of the plate to be tempered, while the length and breadth of the jaws must be such that the largest plate which they are designed to temper may be held between them without overreaching their edges.

Each jaw of the clamp consists of a series of ribs united at their opposite extremities to bars (b, and 0,), the bars are tted with the hinges (C) which unite them;y

an'd the bars b, are fitted with handle (e) for opening and closing thev jaws, and applying clamps or other fastenings to, for the purpose of keeping them closed, when the plate is between them. The ribs (a.) are wedge shaped or triangular in section; thickv on the back or outside, and thin on t-he inside, where they bear on the plate of steel held bet-ween them to be hardened. y

The ribs should be equal in number in each jaw, and those in one jaw exactly opposite those in the other, they should also be straight or curved on their inner edge, as required to conform to the shape of the plate to he hardened, if the plate should have a double curvature, like the moldboard of a plow for example, the finner edges of l the bars should be so shaped as to conform to such 'a shape, then the ribs will bear upon the plate 4of steel on opposite sides, in a series of lines, holding it firmly, but permitting a free access of heat, or water, on each side of these lines, so that, in effect, the entire surface of the plate is so exposed, as to be heated, hardened, and tempered evenly, while held in the clamp.

Having thus described my improved clamp for holding steel plates while being tempered, what yI claim therein as new, and desire to secure by `Letters Patent is Making the ribs wedge shaped; thick exteriorly, and thin at the edge-where they come inco-ntact-with the plate undergoing hardening.

CHARLES W. FILLMORE. Witnesses:

WM. J. FIILMORE, S. H. PELTON. 

